package com.shi.service;

import com.alibaba.fastjson.JSON;
import com.shi.dao.LoginTicketMapper;
import com.shi.dao.UserMapper;
import com.shi.entity.LoginTicket;
import com.shi.entity.User;
import com.shi.utils.CommunityConstant;
import com.shi.utils.CommunityUtil;
import com.shi.utils.MailClient;
import com.shi.utils.RedisKeyUtil;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.stereotype.Service;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;

import java.util.*;
import java.util.concurrent.TimeUnit;

/**
 * @author 石泉
 * @version 1.0
 * @date 21/08/14 10:50
 */
@Service
public class UserService implements CommunityConstant {

    @Autowired
    private UserMapper userMapper;


    @Autowired
    private MailClient mailClient;

    @Autowired
    private TemplateEngine templateEngine;

//    @Autowired
//    private LoginTicketMapper loginTicketMapper;
    @Autowired
    @Qualifier("redisTemplate1")
    private RedisTemplate redisTemplate;

    @Value("${community.path.domain}")
    private String domain;

    @Value("${server.servlet.context-path}")
    private String contextPath;

    public User findUserById(int id) {
//        return userMapper.selectById(id);
        User user = getCache(id);
        if (user == null) {
            user = initCache(id);
        }
        return user;
    }


    /**
     * 用户注册
     *
     * @param user
     * @return 错误信息
     */
    public Map<String, Object> register(User user) {
        Map<String, Object> map = new HashMap<>();

        // 空值处理
        if (user == null) {
            throw new IllegalArgumentException("参数不能为空");
        }
        if (StringUtils.isBlank(user.getUsername())) {
            map.put("usernameMsg", "账号不能为空");
            return map;
        }
        if (StringUtils.isBlank(user.getPassword())) {
            map.put("passwordMsg", "密码不能为空");
            return map;
        }
        if (StringUtils.isBlank(user.getEmail())) {
            map.put("emailMsg", "邮箱不能为空");
            return map;
        }

        // 验证账号
        User u = userMapper.selectByName(user.getUsername());
        if (u != null) {
            map.put("usernameMsg", "该账号已存在！");
            return map;
        }

        // 验证邮箱
        u = userMapper.selectByEmail(user.getEmail());
        if (u != null) {
            map.put("emailMsg", "该邮箱已被注册！");
            return map;
        }

        // 注册用户
        user.setSalt(CommunityUtil.generateUUID().substring(0, 5));
        user.setPassword(CommunityUtil.md5(user.getPassword() + user.getSalt()));
        user.setType(0);
        user.setStatus(0);
        user.setActivationCode(CommunityUtil.generateUUID()); //激活码
        user.setHeaderUrl(String.format("http://images.nowcoder.com/head/%dt.png", new Random().nextInt(1000)));
        user.setCreateTime(new Date());
        userMapper.insertUser(user);

        // 激活邮件
        Context context = new Context();
        context.setVariable("email", user.getEmail());

        // http://localhost:8080/community/activation/101/code
        String url = domain + contextPath + "/activation/" + user.getId() + "/" + user.getActivationCode();
        context.setVariable("url", url);
        String content = templateEngine.process("/mail/activation", context);
        mailClient.sendMail(user.getEmail(), "激活账号", content);

        return map;
    }


    /**
     * 激活用户
     * @param userId 用户id
     * @param code 激活码
     * @return 激活状态
     */
    public int activation(int userId,String code){
        User user = userMapper.selectById(userId);
        if(user.getStatus() == 1){
            return ACTIVATION_REPEAT;
        }else if(user.getActivationCode().equals(code)){
            userMapper.updateStatus(userId,1);
            clearCache(userId);
            return ACTIVATION_SUCCESS;
        }else{
            return ACTIVATION_FAILURE;
        }
    }

    /**
     * 登录
     * @param username
     * @param password
     * @param expiredSeconds
     * @return
     */
    public Map<String, Object> login(String username,String password,int expiredSeconds){
        Map<String, Object> map = new HashMap<>();

        //空值处理
        if(StringUtils.isBlank(username)){
            map.put("usernameMsg","账号不能为空！");
            return map;
        }
        if (StringUtils.isBlank(password)){
            map.put("passwordMsg","密码不能为空！");
            return map;
        }
        // 验证账号
        User user = userMapper.selectByName(username);
        if(user == null){
            map.put("usernameMsg","该账号不存在!");
            return map;
        }
        // 验证状态
        if(user.getStatus() == 0){
            map.put("usernameMsg","该账号未激活!");
            return map;
        }

        //验证密码
        password = CommunityUtil.md5(password+user.getSalt());
        if(!user.getPassword().equals(password)){
            map.put("passwordMsg","密码不正确!");
            return map;
        }

        // 生成登录凭证
        LoginTicket loginTicket = new LoginTicket();
        loginTicket.setUserId(user.getId());
        loginTicket.setTicket(CommunityUtil.generateUUID());
        loginTicket.setStatus(0);
        loginTicket.setExpired(new Date(System.currentTimeMillis() + expiredSeconds*1000));
//        loginTicketMapper.insertLoginTicket(loginTicket);
        String ticketKey = RedisKeyUtil.getTicketKey(loginTicket.getTicket());
        redisTemplate.opsForValue().set(ticketKey, loginTicket);

        map.put("ticket",loginTicket.getTicket());

        return map;
    }

    /**
     * 退出登录
     * @param ticket
     */
    public void logout(String ticket){
//        loginTicketMapper.updateStatus(ticket,1);

        String ticketKey = RedisKeyUtil.getTicketKey(ticket);
        LoginTicket loginTicket = (LoginTicket)redisTemplate.opsForValue().get(ticketKey);
        loginTicket.setStatus(1);
        redisTemplate.opsForValue().set(ticketKey,loginTicket);
    }

    /**
     * 查找用户的登录凭证
     * @param ticket
     * @return
     */
    public LoginTicket findLoginTicket(String ticket){
//        return loginTicketMapper.selectByTicket(ticket);
        String ticketKey = RedisKeyUtil.getTicketKey(ticket);
        return (LoginTicket)redisTemplate.opsForValue().get(ticketKey);
    }

    /**
     * 修改头像
     * @param userId
     * @param headerUrl
     * @return
     */
    public int updateHeader(int userId,String headerUrl){
//        return userMapper.updateHeader(userId, headerUrl);
        int rows = userMapper.updateHeader(userId, headerUrl);
        clearCache(userId);
        return rows;
    }

    /**
     * 修改密码
     * @param user
     * @param oldPassword
     * @param newPassword
     * @param checkPassword
     * @return
     */
    public Map<String, Object> updatePassword(User user,String oldPassword,String newPassword,String checkPassword){
        Map<String, Object> map = new HashMap<>();
        if(StringUtils.isBlank(oldPassword)){
            map.put("oldPassword","原始密码不能为空");
            return map;
        }
        if(StringUtils.isBlank(newPassword)){
            map.put("newPassword","新的密码不能为空");
            return map;
        }
        if(StringUtils.isBlank(checkPassword)){
            map.put("checkPassword","确认密码不能为空");
            return map;
        }
        if(!newPassword.equals(checkPassword)){
            map.put("checkPassword","两次输入的密码不一致!");
            return map;
        }
        oldPassword = CommunityUtil.md5(oldPassword+user.getSalt());
        if(!oldPassword.equals(user.getPassword())){
            map.put("oldPassword","原始密码错误");
            return map;
        }
        newPassword = CommunityUtil.md5(newPassword+user.getSalt());
        userMapper.updatePassword(user.getId(),newPassword);

        return map;
    }

    public User findUserByName(String username){
        return userMapper.selectByName(username);
    }

    // 缓存
    // 1. 优先从缓存中取值
    private User getCache(int userId){
        String userKey = RedisKeyUtil.getUserKey(userId);
        return (User)redisTemplate.opsForValue().get(userKey);
    }
    // 2. 取不到时初始化缓存数据
    private User initCache(int userId){
        User user = userMapper.selectById(userId);
        String userKey = RedisKeyUtil.getUserKey(userId);
        redisTemplate.opsForValue().set(userKey,user,3600, TimeUnit.SECONDS);
        return user;
    }
    // 3. 数据变更时清楚缓存数据
    private void clearCache(int userId){
        String userKey = RedisKeyUtil.getUserKey(userId);
        redisTemplate.delete(userKey);
    }

    public Collection<? extends GrantedAuthority> getAuthorities(int userId){
        User user = this.findUserById(userId);
        List<GrantedAuthority> list = new ArrayList<>();
        list.add(new GrantedAuthority() {
            @Override
            public String getAuthority() {
                switch (user.getType()){
                    case 1:
                        return AUTHORITY_ADMIN;
                    case 2:
                        return AUTHORITY_MODERATOR;
                    default:
                        return AUTHORITY_USER;
                }
            }
        });
        return list;
    }
}
